JPH02614B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a combustion control device of the type that provides transfer ignition to a main burner via an ignition burner by operating a manual operating member to an ignition position. As a conventional device of this kind, an electromagnetic safety valve that is held open by an electromotive force from a thermoelectric generating element facing the main burner is interposed in the gas supply path to the main burner, and
An ignition valve is interposed in the gas supply path to the ignition burner provided on the side of the main burner, and a manual operation member that can be freely switched between a stop position, an ignition position, and a combustion position is provided, and the manual operation member ignites. By operating the electromagnetic safety valve and the ignition valve to open the valves, the main burner is ignited via the ignition burner, and the manual operation member is switched from the ignition position to the combustion position. A device releases the pressure opening of the electromagnetic safety valve and the ignition valve, and maintains the electromagnetic safety valve open for a certain period of time at the initial stage of ignition until a predetermined electromotive force is generated from the thermoelectric generating element after the pressure is released. By providing a valve-open holding means, even if the manual operation member is immediately switched from the ignition position to the combustion position after ignition without holding it in the ignition position for a certain period of time until a predetermined electromotive force is generated from the thermoelectric generating element, the main A type of burner is known in which the combustion of the burner is continued.

This device is convenient in use because it reduces the time it takes to hold the manually operated member in the ignition position, but generally speaking, the ignition valve closes immediately when the manually operated member is switched from the ignition position to the combustion position. to do,
If the type of main burner or the type of gas is changed and the main burner is not immediately provided with cross-fire ignition via the ignition burner, the manual operating member is moved to the ignition position until cross-fire ignition is provided to the main burner. The ignition valve must be held in the open state by holding the manual operation member in the ignition position, and the purpose of the valve-open holding means provided to shorten the time for holding the manual operation member in the ignition position is inconvenient. be.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combustion control device that can shorten the time for holding a manually operated member in the ignition position even when the main burner is not immediately provided with transfer ignition via the ignition burner. An electromagnetic safety valve that is held open by an electromotive force from a thermoelectric generating element facing the main burner is interposed in the gas supply path to the main burner, and an electromagnetic safety valve is installed in the gas supply path to the ignition burner provided on the side of the main burner. An ignition valve is interposed in the gas supply path, and a manual operation member that can be freely switched between a stop position, an ignition position, and a combustion position is provided, and when the manual operation member is operated to the ignition position, the electromagnetic safety valve and the ignition valve are switched. The electromagnetic safety valve and the ignition valve are pressed open to give the main burner ignition via the ignition burner, and the electromagnetic safety valve and the ignition valve are pressed open by switching the manual operation member from the ignition position to the combustion position. A first valve opening holding means is provided for opening the valve and holding the electromagnetic safety valve open for a certain period of time at the initial stage of ignition until a predetermined electromotive force is generated from the thermoelectric generating element after the pressure is released. A second valve-open holding means for keeping the ignition valve open even after the pressure is released, and a flame detection means facing the main burner are provided, and the second valve-open holding means is controlled by the detection output of the flame detection means. The invention is characterized in that the ignition valve is released from being held open by the ignition valve.
Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In the one shown in the first figure, an ignition burner 2 is arranged side by side on the side of a main burner 1, and a gas supply path 3 to the main burner 1 is connected to the upstream side of a branch part of a gas supply path 4 to the ignition burner 2. An electromagnetic safety valve 6 is controlled by a thermocouple 5, which is a thermoelectric generating element located and facing the main burner 1.
and a cutoff valve 7 located on the downstream side of the branch part, and an ignition valve 8 in the gas supply path 4 to the ignition burner 2.
is provided, and by driving the igniter 9 facing the ignition burner 2, the ignition is applied to the main burner 1 via the ignition burner 2.

The electromagnetic safety valve 6, cutoff valve 7, and ignition valve 8 are as follows:
It is operated by a common manual operation member 10 shown in FIG. A push rod 10a disposed opposite to the rod 7a and the valve rod 8a of the ignition valve 8, and an operating rod 10b connected at the front end to an intermediate portion of the push rod 10a.
Push button 10c attached to the rear end of the operating rod 10b
and a conventionally known push-button mechanism 10d assembled to the operating rod 10b, the push button 10c is returned from the stop position A to the forward ignition position B so that it can be pressed against the spring 10e, and the ignition is activated. When the pressure is released at position B, the combustion position C is locked between the stop position A and the push button 10c is moved to the combustion position C.
If you push it a little forward by pressing from
The lock at the combustion position C is released and the lock is returned to the stop position A, and further, as shown in FIG. A capacitor 12 that forcibly holds the electromagnetic safety valve 6 in an open state for a certain period of time by discharging and a changeover switch 13 that switches the capacitor 12 between a charging side and a discharging side are provided. A first valve-open holding means 14 is constructed, and the switches 11 and 13 are arranged so as to be operated by contacting the protrusion 15 on the operating rod 10b, and thus the push button 10c is at the stop position A.
According to the pressing operation from to the ignition position B, the cutoff valve 7 first begins to open, then the switching of the changeover switch 13 starts discharging to the operating solenoid 6b, and when the combustion position C is exceeded, the cutoff valve 7 starts to open. Valve 7
The valve rod 7a of the electromagnetic safety valve 6 comes into contact with the valve rod 6a of the electromagnetic safety valve 6, and the electromagnetic safety valve 6 begins to be opened by pressure.Then, at the ignition position B, the ignition valve 8 is opened and the ignition switch 11 is closed. The igniter 9 is driven and ignition is provided via the ignition burner 2, and then the pressing operation of the push button 10c at the ignition position B is released and the push button 10c is returned to the combustion position C to drive the igniter 9. At the same time, the pressure between the electromagnetic safety valve 6 and the ignition valve 8 is released. In this case, after ignition, the electromagnetic safety valve 6 is forcibly held open for a certain period of time by discharge from the capacitor 12 of the first valve-open holding means 14, and during that time the thermocouple 5 is heated to a predetermined temperature. Thereafter, unless a misfire occurs due to the predetermined electromotive force of the thermocouple 5, the valve is kept open and combustion in the main burner 1 continues. In this case, in the conventional device, when the pressing operation of the push button 10c at the ignition position B is released and the pressure on the ignition valve 8 is released, the ignition valve 8 is immediately closed, and the main burner is closed. 1 through the ignition burner 2, it is necessary to continue pressing the push button 10c at the ignition position B until the spark ignition is provided through the ignition burner 2. There is an inconvenience that the reason for the existence of 14 will be lost.

In order to eliminate this inconvenience, the present invention provides a second valve-open holding means 16 that holds the ignition valve 8 open even after the pressure is released, and a flame detection means 17 that faces the main burner 1. The present invention is characterized in that the holding of the ignition valve 8 held open by the second valve-open holding means 16 is released based on the detection output of the flame detection means 17.

In the illustrated example, the flame detection means 17 is made of a bimetal, and the second valve opening holding means 15 is controlled by an actuating piece 16a whose lower end is pushed upward by the curvature of the bimetal, and by the upward movement of the actuating piece 16a. A swing piece 16c that swings about the pivot pin 16b as a fulcrum, and a locking piece 16 that moves up and down as the swing piece 16c swings.
d and a protrusion 16e that cooperates with the locking piece 16d provided on the valve rod 8a of the ignition valve 8, and when the push button 10c is pressed to the ignition position B, the protrusion 16e The locking piece 16d is pushed up, the protrusion 16e is moved forward of the locking piece 16d, and when the push button 10c is released from the ignition position B, the ignition valve 8 is released from being pressed open. However, the projection 16e engages with the lower end of the locking piece 16d, and the return operation of the valve rod 8a by the return spring 8b is stopped, so that the ignition valve 8 is maintained in the open state. In this case, after the flame transfer ignition of the main burner 1 via the ignition burner 2, the flame detection means 1
7 detection output, that is, the actuating piece 16a and the swinging piece 16c are bent due to heating of the bimetal main burner 1.
The locking valve 16d moves upward via the valve rod 8a.
The engagement between the protrusion 16e and the lower end of the locking piece 16d is released, the return operation of the valve lever 8a by the return spring 8b is started, the valve lever 8a is returned to its original starting position, and the ignition The valve 8 was opened and the ignition burner 2 was extinguished.

In Figure 1, 18 is the main valve, 19 is the power source for the igniter 9,
Reference numeral 20 indicates a power source for charging the capacitor 12, respectively.

Next, to explain its operation, when the main valve 18 is opened and the push button 10c of the manual operation member 10 is pressed from the stop position A to the ignition position B, the shutoff valve 7, the electromagnetic safety valve 6, and the ignition valve 8 are sequentially activated. At the same time as the valve is pressed open, the igniter 9 is driven, and the main burner 1 is ignited via the ignition burner 2. Then, the pressing operation of the push button 10c is immediately released and the switching operation from the ignition position B to the combustion position C is performed.
According to the present invention, the push button 10c at the ignition position B
Even if the pressing operation is released before the main burner 1 is ignited, the ignition valve 8 is kept open by the second valve-open holding means 16, and the ignition burner 2 continues to be ignited. Even when the ignition is slow, the ignition can be reliably ignited.

In this way, according to the present invention, in addition to the first valve-open holding means that holds the electromagnetic safety valve open for a certain period of time after the pressure is released, the second valve-open holding means that holds the ignition valve open even after the pressure is released. Further, a flame detection means facing the main burner is provided, and the detection output of the flame detection means releases the opening holding of the ignition valve by the second valve opening holding means, so that the ignition burner is Even if the cross-fire ignition of the main burner through the burner is slow, the cross-fire ignition shall be automatically and reliably provided, and the operation of the manually operated member in the ignition position must be continued until the cross-fire ignition is provided. Compared to the conventional device, the time for holding the manual operation member at the ignition position can be shortened, which is advantageous in use.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one example of implementation of the present invention,
FIG. 2 is a detailed explanatory diagram of the main parts. DESCRIPTION OF SYMBOLS 1... Main burner, 2... Ignition burner, 3, 4... Gas supply path, 5... Thermocouple (thermoelectric generating element), 10... Manual operation member, 14... First valve opening holding means, 16... Second
Valve open holding means, 17...bimetal (flame detection means).

Claims (1)

[Claims] 1. An electromagnetic safety valve that is held open by an electromotive force from a thermoelectric generating element facing the main burner is interposed in the gas supply path to the main burner, and an electromagnetic safety valve is installed in the gas supply path to the ignition burner provided on the side of the main burner. An ignition valve is interposed in the gas supply path, and a manual operation member that can be freely switched between a stop position, an ignition position, and a combustion position is provided, and the electromagnetic safety valve and the ignition valve are operated by operating the manual operation member to the ignition position. The valve is pressed open to give the main burner ignition via the ignition burner, and the electromagnetic safety valve and the ignition valve are pressed open by switching the manual operating member from the ignition position to the combustion position. and a first valve-open holding means for holding the electromagnetic safety valve open for a certain period of time at the initial stage of ignition until a predetermined electromotive force is generated from the thermoelectric generating element after the pressure is released, the ignition A second valve-open holding means for holding the valve open even after the pressure is released, and a flame detection means facing the main burner are provided, and the second valve-open holding means is activated by the detection output of the flame detection means. A combustion control device characterized in that the ignition valve is released from being held open.